Rolls for reducing grain



2 Sheets-Sheet 1.

.' W. D. GRAY.

Rolls for Reducing Grain, Middlings, 8w.

- No. 228,525. H Patented June 8, I880.

2 I 2 Sheets-8haet 2:

W. D. GRAY.

Rolls for Reducing Grain, Middlings, 8L0. No. 228,525. Patented June 8,1880.

\Nn'nesscs \NVENTOR N, FETEKS. FhclmLiiMnphor. Wbhinholl. DJ}.

UNITED STATES PATENT ()FFIoE.

VVILlJIAM l). GRAY, ()F MILWAUKEE, WISCONSIN.

ROLLS FOR REDUCING GRAIN, MIDDLINGS, 800.

SPECIFICATION forming part of Letters Patent No. 228,525, dated June 8, 1880.

Application filed May 2, 1879.

To ctZZ whom, it may concern:

Be it known that I, WILLIAM D. GRAY, of Milwaukee, in the county of Milwaukee an d State of YVisconsin, have invented certain I1nprovements in Grinding-ltlills, of which the following is a specification.

My invention relates to that class of mills in which horizontal grinding-rolls arranged in pairs are employed; and the invention consists in the improved arrangement of belts and pulleys for communicating motion to the rolls, and in other minor details hereinafter described in detail.

In the accompanying drawings, Figure 1 represents a side elevation of the same; Fig. 2, a top-plan View of the rolls and their operating-belts; and Fig. 3, an end elevation of the sanie, partly in section.

It has been found by experience that when the rolls are driven by gearing a great deal of noise and a jarring of the parts of the appara tus and trembling of the millJloor result, and this jarring and trembling in turn cause an unevenness of operation or grindingand a rapid and uneven Wear of the rolls. To obviate these difficulties and produce an even, steady motion I discard the gearing hitherto employed, and substitute therefor a system of belting arranged in a' peouliarmanner, to give the proper direction and speed to the rolls. In the drawings, Arepresents the frame or body of the machine, in the upper part of which are mounted, in pairs, a series of grinding or crushing rolls, (T'D E F. Above the grinding-rolls is arranged a hopper provided with feeding-rolls G H, arranged to deliver the grain to each pair of rolls.

B represents a counter-shaft, which is represented in the drawings as extending transversel y through the base of the frame or body A, parallel with the grinding-rolls, but which may, if desired, be located entirely Without the machine.

As represented in Figs. 1 and 2, the grindin g-rolls-are furnished alternately at opposite ends each with a belt-wheel or pulley, while the eonnter-shaft B is furnished at one end with one wheel or pulley and at its opposite end with two.

N represents the main driving-belt, which passes to and around the pulley c of the roll (J, thence downward and around pulley Z) of the counter 1 shaft 13, thence upward and around pulley c 01; the roll E, and back to the source of power, imparting to the rolls 0 and E a motion in one direction, and to the counter-shaft a motion in the reverse direct-ion. From the pulleys Z1 b" on the rear end of the counter shaft 15, belts I and R pass upward and around pulleys d and f of the rolls D F, as shownin Fig. 2, imparting to said rolls a motion the reverse of that of the rolls 0 E. In this way the two rolls of each set are caused to revolve toward each other while being all driven from a common source primarily.

The use of belting obviates all the noise incident to gearing and produces a much more even and steady motion, each roller being driven from the counter-shaft, instead of one from another, as heretofore.

Another advantage incident to the arrangement of belting above described is, that by simply removing the pulley of any shaft and replacing it'with another of proper size, any desired difference in the speed of the rolls may be obtained, whereas in the case of gearing this cannot be accomplished except through the use of a very complicated arrangement of intermediate wheels.

In order to adapt the counter-shaft B to perform the double purpose of reversing the motion of certain of the rolls and of acting as a belt-tightener, it is mounted, at opposite sides of the frame or body A, in boxes swiveled or hung in yokes L, sliding vertically in guides or boxes K, and adjusted up and down therein by screw rods or stems S, the swivel boxes permitting a slightly greater movement of the shaft B at one end than at the other without interfering with its free rotation, and thereby permitting the tightening of the belt disturbing those at the other.

In order to adjust and maintain the rolls the two outer rolls, G and F, are carried in sliding boxes, which are formed each with a T rib or standard, at, moving in a groove or Way of corresponding shape, the rolls being held up to their operative position by springs or belts at one side of the machine without,

0 D and E F in proper relation to eachother,

U, which, in turn, are regulated in pressu re by screws T.

Clamping-screws may be arranged to secure the sliding boxes Q in any desired position.

By the above arrangement of the sliding boXes they are prevented from being advanced or retracted unequally, and thereby giving the rolls a winding position.

It is desirable that when the rolls are notemployed in grinding they should be held apart, as otherwise they would be liable to injury by direct contact, and also subjected to unnecessary wear. To accomplish their ready separation I place just in front of each sliding box Q a rotating cam or eccentric, Y, which when turned in one direction permits the box to be advanced, but when given a partial revolution about its axis forces and holds back the same.

lhe meal, after being crushed by the rollers, sometimes packs or cakes together; and for the purpose of regranulating the same it is passed through a disintegrator.

The disintegrator-cylinder may be mounted on and driven by the counter-shaft B, as shown in Fig. 3, in which case the usual surrounding shell or casing (shown in the drawings) will need to be adjustable vertically.

The peculiar manner of or means for adj usting the shell forms no part of the present i11- vention, and need not, therefore, be described.

in detail herein. Many arrangements such as the use of bolts and slots, or adjustingscrews, for example-will suggest themselves to the skilled mechanic.

Machines of this class are found to be impaired in their operation through the heating of the roller-journals. To overcome this defeet I form on the shafts of the rollers, and also 011 the counter-shaft, near each end, acollar, m, which serves both to prevent end play of the shaft and to carry upward continually a supply of oil from the chamber or supplyz to the upper side of the shaft and box,'whence it spreads out over the entire surface of the bearing and journal.

The boxes are each formed with an annular oil-chamber, c, at each end, communicating by inclined passages to with the supply chamber or sink a. In this way a perfect lubrication of the bearings is constantly maintained and heating is obviated.

The feed-rolls G H are furnished at their ends with pulleys g h, which are driven by belts from the grinding-rolls D E, which, being stationary, cannot interfere with the tension of the belts, as would the adjustable rolls I am aware that various devices have hitherto been employed to regulate the distance between the rolls, in order to govern the fineness of the material delivered from them, and I am also aware that shafts have been made movable in such manner as to tighten belts passing over pulleys on other shafts, and I lay no claim thereto; but I believe myself the first to construct and organize a grinding-mill in the peculiar manner herein shown and described, whereby the single belt is caused to operate the various parts in the required directions and the disintegrating cylinder caused to keep the belt tight.

Having thus described my invention, what I claim is-- 1. In a roller grinding-mill, the combination of the counter-shaft provided with pulleys at both ends and having said ends mounted in vertically and independently adjustable bearings, the rolls C E, having pulleys connected 'by belts with one end of the counter-shaft, and the rolls D F, independently connected by belts with the other end of the countershaft, as shown.

2. In arollergrinding-mill, a disintegratingcylinder connected at its two ends by belts with the rolls, in combination with independently and vertically adjustable supports connected by transverse pivots with the boxes sustaining the ends of the cylinder, in the manner described and shown.

3. In a roller-mill, the combination of the frame, the cylinder, the pivoted bearings K, the forked arms L, having the bearings therein, and the screw S, shown.

WILLIAM DICKENSON GRAY.

Witnesses G. E. PALMER, L. R. Hum).

In compliance with the raged: of the patentee, Letters Patent No. 228,525 granted June 8. 1880, to William D. Gray, of Milwaukee, is., 01- an Improvement in Rqlls for Reducing Grain, Middlinfs, 930., are hereby limited so as to expire with ngiish patent dated FebruaryJZ, 1879, and numbered 551. t is hereby certified that the roper entries and corredtions have been made in the files and records of the Pptent Ofiice. This amendment is made that the United States patent may conform to the provisionspl' section 488"! of the Revised Statutes.

Signed, ooimteraigned, and sealed this 7th day of August, A. D. 1883.

[am] M. L. JOBLYN, 4

Acting Secretary of the Inierior.

- Countersigned: 1

E. M. Mmamc,

Commissioner of Patents. 

